I really like the idea to use readymade, simple light sources to paint light with. One issue that was offered by coach Rob Tieben, was that parts of the installation could get stolen or vandalised. If teenagers bring their own objects to use, this would not be a problem. People nowadays have a multitude of electronic gadgets with them. I have mentioned the digital watch and cell phone, my team mate Daniel said bicycle lights and lighters.
If I take it a step further, I am thinking of writing an app that makes the screen of a smartphone different colours or patterns, even using blinking or colour changes.
Or how about designing some new artifacts, specifically for the purpose of light painting? It could take the shape of jewellery, not only useful for making light art, but also beautiful to wear.